1. QGIS (2006) Homepage of the QGIS project.
http://qgis.org
. Accessed 21 Dec 2006
2. Sherman et al. (2006) QGIS user guide.
http://qgis.org/releases/userguide.pdf
. Accessed 21 Dec 2006
3. GRASS (2006) Homepage of the GRASS project.
http://www.grass.itc.it/
. Accessed 21 Dec 2006
4. Trolltech (2006) Qt documentation.
http://doc.trolltech.com/
. Accessed 21 Dec 2006
5. QGIS WMS (2006) QGIS WMS server homepage.
http://karlinapp.ethz.ch/qgis_wms/qgis_wms.html
. Accessed 21 Dec 2006